10 surprising ways famous film special effects were made

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So says 3D's biggest advocate, James Cameron, of the process of turning Titanic from 2D to three. It's not a case of find and replace, it's a manual labour of love. "It is a mind-numbing process of creating depth subjectively," he says. "I sit there with the jog wheel and look through the movie frame-by-frame and make notes on depth. That should be closer, that should be further back, there's not enough full depth here... It's like mowing the lawn with a toenail clipper."